1. Department of Epidemiology and Biostatistics, School of Public Health, Nantong University, Nantong, Jiangsu, China
2. Department of Gastroenterology, Affiliated Hospital of Nantong University, Nantong, Jiangsu, China
3. Department of Geriatrics, The First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu, China
4. Center for Disease Control and Prevention of Nantong, Nantong, Jiangsu, China
5. Department of Oncology, the Sixth People's Hospital of Nantong, Nantong, Jiangsu, China
6. Nantong Prison Hospital, Nantong, Jiangsu, China